A Calibration Method for Measuring Leaf Area Index Using Plant Canopy Analyzer

A technology of leaf area index and correction method, which is applied in the field of forest ecology, can solve the problem of low accuracy of measuring leaf area index, and achieve the effect of true and reliable data, easy realization, and comprehensive consideration
CN104330058BActive Publication Date: 2017-05-03NORTHEAST FORESTRY UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHEAST FORESTRY UNIVERSITY
Publication Date
2017-05-03

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Abstract

The invention provides a correction method for measuring a leaf area index by use of a plant canopy analyzer, relates to a correction method for measuring the leaf area index and aims at solving the problem that the existing measuring method by use of the LAI-2000 plant canopy analyzer is limited and low in leaf area index estimation accuracy. The correction method is used for obtaining an LAI value by use of the LAI-2000 plant canopy analyzer; correction is based on a formula as shown in the description; in the formula, L represents the LAI numerical value after correction and Le represents the LAI numerical value before correction; alpha, omega E and gamma E in the formula are correction coefficients, wherein alpha is the proportion of a lignin index in the total LAI, and the values of alpha of an artificial Korean pine forest and a betula platyphylla secondary forest are 0.03 and 0.04, respectively; omega E is a crowding index, and the values of omega E of the artificial Korean pine forest and the betula platyphylla secondary forest are 0.95 and 0.87, respectively; gamma E is a needle-cluster ratio. The correction method for measuring the leaf area index by use of the plant canopy analyzer takes the influence of the crowding effect into account and is comprehensive in the range of consideration, and the obtained data are true and reliable.
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Description

technical field

[0001] The invention relates to a correction method for leaf area index, in particular to a correction method for measuring leaf area index by using LAI-2000 plant canopy analyzer, and belongs to the field of forest ecology. Background technique

[0002] Leaf area index (LAI) refers to half of the total leaf surface area per unit surface area (Chen and Black, 1992). LAI affects the microclimate in the forest ecosystem canopy, determines radiative transfer, transpiration, water and carbon exchange between the canopy and the atmosphere, and is also an important component of biogeochemical cycles in simulated ecosystems. Meanwhile, LAI is closely related to stand productivity. Therefore, accurate determination of LAI is crucial for further understanding of many physiological and ecological processes. At present, the determination methods of LAI are mainly divided into direct method and indirect method. The direct method mainly includes the destructive samplin...

Claims

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